Adding a shower to half bath*rough-in question
Here's the deal... I am going to be adding a shower to an existing 1/2 bath in my basement.
The toilet is vented up out of the slab on the other side of the wall,in my utility closet, makes about a 4' run into another wall where it ties into the lav. /washing machines' drain.
the lav./washing machine waste pipe exits this same wall and is tied into the main stack at a 4X2 fitting and the vent pipe continues up that wall and I assume ties into the main vent at a higher, unseen piont.
Now for my question... I am going to be jackhammering the slab the opposite side of the toilet than my utility closet... where should I head with the showers drain... the closet flange?. can I tie it in on that short, straight run from the closet flange to the main line? Or at it's elbow... Is the venting for this group designed so I can add this shower without it's own vent.
One more question... my washing machine has one of those high speed pumps and if I don't keep it's waste line cleaned out the washing machine's waste water sometines will back up into the sink when it dumps. I also get those dreaded toilet moans from this 1/2 baths toilet when the washer dumps.. If that waste line isn't completely cleared and I put the shower stall in will the water back up into that also?
thanks for your help...